think8848

#include <png.h>
#include <vector>
#include <iostream>
#include <stdlib.h>

//encode and write PNG to memory (std::vector) with libpng on C++

typedef unsigned char ui8;
#define ASSERT_EX(cond, error_message) do { if (!(cond)) { std::cerr << error_message; exit(1);} } while(0)

think8848

public class Demo
{
    public event EventHandler DemoEvent;

    public void Raise()
    {
        this.DemoEvent?.NaiveRaiseAsync(this, EventArgs.Empty).GetAwaiter().GetResult();
        Console.WriteLine("All handlers have been executed!");
    }
}

think8848

Create Root CA (Done once)

Create Root Key

Attention: this is the key used to sign the certificate requests, anyone holding this can sign certificates on your behalf. So keep it in a safe place!

openssl genrsa -des3 -out rootCA.key 4096

think8848

import numpy as np

def cart2pol(x, y):
    '''
    cartesian to polar coordinates
    '''
    theta = np.arctan2(y, x)
    rho = np.sqrt(x**2 + y**2)
    return (theta, rho) 

think8848

/**
 * 百度坐标（BD09）、国测局坐标（火星坐标，GCJ02）、和WGS84坐标系之间的转换的工具
 * 
 * 参考 https://github.com/wandergis/coordtransform 实现的Java版本
 * @author geosmart
 */
public class CoordinateTransformUtil {
	static double x_pi = 3.14159265358979324 * 3000.0 / 180.0;
	// π
	static double pi = 3.1415926535897932384626;